<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    async function main(){
      //1.如果返回值是一个非Promise类型的数据
      //return '111'
      //2.如果返回的是一个Promise对象
      // return new Promise((resolve,reject) => {
      //   resolve('OK')
      // })
      //3.抛出异常
      throw 'oh no'
    }
    
    let result = main();

    console.log(result);
  </script>
</body>
</html>